Simulation and design of solar-blind Raman Lidar for water vapor measurement

Dongchen Shi; Dengxin Hua; Fei Gao; Ning Lei; Li Wang

doi:10.1117/12.2256278

28 February 2017 Simulation and design of solar-blind Raman Lidar for water vapor measurement

Dongchen Shi, Dengxin Hua, Fei Gao, Ning Lei, Li Wang

Proceedings Volume 10256, Second International Conference on Photonics and Optical Engineering; 102565Z (2017) https://doi.org/10.1117/12.2256278
Event: Second International Conference on Photonics and Optical Engineering, 2016, Xi'an, China

Abstract

A novel water vapor Raman Lidar is developed at a solar-blind wavelength of 266nm. To obtain signals of Mie-Rayleigh scattering spectra and Raman scattering spectra of H₂O, N₂ and O₂ with fine separation and high efficient extraction, a newly high-efficiency Raman polychromatic system is designed using the combination of dichroic mirrors and narrow– band interference filters. Using the standard atmospheric scattering models and aerosol extinction coefficients, the rejection rate of Mie-Rayleigh scattering signals and the signal-to-noise ratio of atmospheric water vapor measurement are simulated. The optimal parameters of Lidar system are obtained based on the detailed analysis and the discussion of the SNR of echo signals. Lidar emission wavelength and Raman scattering echo wavelengths are all in the ultraviolet range below 300nm known as the “solar-blind” region, because practically all radiation at these wavelengths is absorbed by the ozone layer in the stratosphere. It has the advantage of detecting water vapor in the daytime without the influence of solar background radiation in the system. Through the comparison between the Raman Lidars at the wavelengths of 266nm and 355nm respectively, it is concluded that the detection performance of the designed system at 266nm is better than the Raman Lidar system at 355nm during the daytime measurement, and the measurement height can be up to the 4 km.

Citation Download Citation

Dongchen Shi, Dengxin Hua, Fei Gao, Ning Lei, and Li Wang "Simulation and design of solar-blind Raman Lidar for water vapor measurement", Proc. SPIE 10256, Second International Conference on Photonics and Optical Engineering, 102565Z (28 February 2017); https://doi.org/10.1117/12.2256278

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